Furnace, &amp;c.



PATENTED MAY 29, 1906.

W. PETT. FURNACE, 6w. APPLICATION FILED JUNE 5, 1905.

Wi/Z/am Pei):

lnven or r I F Attorneys Witnesses WILLIAM PETT', OF MUSKEGON. MICHIGAN.

FURNACE, 800.

Specification of Letters Patent.

Patented May 29, 1906.

Application filed June 5 1905. Serial No. 263,831.

To all whom it may concern:

Be it known that I, WILLIAM PETT, a citizen of the United States,residing at Muskegon, in the county of Muskegon and State of Michigan,have invented a new and useful Furnace, &c., of which the following is aspecification.

This invention relates to furnaces and equivalent heating apparatus, anda principal object of the invention is to provide a circuitous passagefor the products of combustion from the fire-box to the point of finalexit, enabling the heat units contained in said products to be utilizedby heating radiating-surfaces or otherwise.

A further object of the invention is to maintain a constant draft byarranging a bypass for the products of combustion in connection with adamper in the main exit-pipe.

Further objects of the invention are to simplify and improve theconstruction and operation of the classof devices to which the inventionbelongs.

With these and other ends in view, which will readily appear as thenature of the invention is better understood, the same consists in theimproved construction and novel arrangement and combination of parts,which will be hereinafter fully described, and particularly pointed oiitin the claims.

In the accompanying drawings has been illustrated a simple and preferredform of the invention as applied to a boiler-furnace, and in. saiddrawings, Figure 1 is a longitudinal sectional view of a steam-boilerfurnace embodying the improvement. Fig. 2 is a transverse sectional viewtaken on the plane indicated by the line 3 3 in Fig. 1.

Corresponding parts in both figures are indicated throughout by similarcharacters of reference.

The drawings illustrate the application of the invention to an ordinaryboiler-furnace, l1 designating an ordinary boiler having flues 12. 13 isthe back wall, and 14 14 represent side walls supporting the boiler, 15representing the furnace-chamber or fire-box, 16 the ash-pit, 17 thegrate, and 18 the back or bridge wall. 19 is the smoke-arch at the frontend of the boiler from which rises the stack 20, in which a damper 21 islocated.

Supported above the boiler upon the walls of the furnace and concentrictherewith is a hood or semicircular casing 22, between which and the topof the boiler is a space 23 communicating at its front end with thesmoke-arch 19 and at its rear end with a pipe 24, which in turncommunicates with the stack 20 above the damper 21. The space 23 and thepipe 24 thus combine to form a bypass through which products ofcombustion may pass from the fire-box to the point of final exit evenwhen the damper 21 is closed, as in Fig. 1.

In operation the products of combustion will pass in the usual mannerover the bridgewall 18 to the rear end of the boiler, thence through theflues 12 to the smoke-arch and out through the stack, either direct orwhen the damper is closed through the by-pass 23 24. The upper portionof the boiler will by this construction be constantly enveloped by aspace which is open to the passage of the products of combustion,thereby not only preventing the loss of heat from the boiler byradiation, but actually exposing the upper portion of the boiler to theheating influence of the flames and products of combustion in the space23.

From the foregoing description, taken in connection with the drawingshereto a'nnexed, the operation and advantages of this invention will bereadily understood by those skilled in the art to which it appertains.

The invention is extremely simple in its nature and general application,and it may be readily applied to furnaces and other heating apparatus ofordinary construction with a gpin of heat at a decreased expenditure offue Having thus described the invention, what is claimed is- Thecombination With a boiler, afurnace and a smoke-arch at the front end ofthe boiler, of a semicircular casing supported. upon the furnace-wallsabove the boiler and spaced from the latter the intermediate spacecommunicating at its front end with the smoke-arch, a stack rising fromthe latter, a smoke-conductor connecting the stack with the rear end ofthe space between the semicircular casing and the boiler, and a damperin the stack between the smokeconductor and the smoke-arch.

In testimony that I claim the foregoing as my-own I have hereto aflixedmy signature in the presence of two witnesses.

WILLIAM PETT. 4

